fix: use @zkochan/dirsum instead of dirsum

package.json

@@ -26,6 +26,7 @@
     "@types/semver": "5.3.30",
     "@types/update-notifier": "1.0.0",
     "@zkochan/cmd-shim": "2.2.1",
+    "@zkochan/dirsum": "0.1.1",
     "@zkochan/hosted-git-info": "2.1.5",
     "arr-flatten": "1.0.1",
     "bole": "3.0.2",
@@ -34,7 +35,6 @@
     "common-tags": "1.4.0",
     "cross-spawn": "^5.0.0",
     "delocalize-dependencies": "0.1.0",
-    "dirsum": "0.1.1",
     "execa": "0.6.0",
     "exists-file": "3.0.0",
     "find-up": "2.1.0",

src/fs/dirsum.ts

@@ -1,4 +1,4 @@
-import dirsum = require('dirsum')
+import dirsum = require('@zkochan/dirsum')
 
 export default function (dirpath: string): Promise<string> {
   return new Promise((resolve, reject) => {

typings/local.d.ts

@@ -238,7 +238,7 @@ declare module 'p-filter' {
   export = anything;
 }
 
-declare module 'dirsum' {
+declare module '@zkochan/dirsum' {
   const anything: any;
   export = anything;
 }